div{
  font-size: 10px;
}
div {
  width: 100px;
  height: 100px;
  background-color: skyblue;
}
* {
  margin: 0 auto;
  padding: 0;
}

h1,
h2,
h3,
h4,
h5,
h6,
p {
  font-size: 16px;
}
